A light-dependent resistor $R$ has a resistance of about $1\,\text{M}\Omega$ in darkness and about $1\,\text{k}\Omega$ when it is lit. It is arranged in series with a $5\,\text{k}\Omega$ resistor and a $1.5\,\text{V}$ cell of negligible internal resistance. The light-dependent resistor is exposed, in an otherwise dark room, to a flashing light. Which graph best indicates how the potential difference $V$ across $R$ changes with time $t$?
Physics 9702 · AS & A Level · Potential dividers